Light bulb



FIG. 1 is a top perspective view of a first embodiment of a light bulb;

FIG. 2 is a bottom perspective view of the embodiment shown in FIG. 1;

FIG. 3 is a side view of the embodiment shown in FIG. 1;

FIG. 4 is another side view of the embodiment shown in FIG. 1;

FIG. 5 is a top view of the embodiment shown in FIG. 1; and,

FIG. 6 is a bottom view of the embodiment shown in FIG. 1.

The subject matter shown in broken lines is environmental and forms no part of the claimed design. 

CLAIM The ornamental design for a light bulb, as shown and described. 